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The only listing here that publishes both its compatible and incompatible system lists

riseem S3001-White

A non-programmable single-stage wall thermostat accurate to ±1 °F, running on 24 V or two AA cells with no C-wire on most systems.

riseem non-programmable thermostat in white with backlit LCD display

riseem S3001-White

A non-programmable single-stage wall thermostat accurate to ±1 °F, running on 24 V or two AA cells with no C-wire on most systems.

Type
Wall thermostat, wired to the HVAC system — not an outlet thermostat
Systems
Single-stage heating and cooling; gas, oil or electric furnace; boiler radiant; forced air; gas fireplace at 24 V; cooling only
Not compatible with
Multi-stage, 3-wire hydronic, heat pumps with or without auxiliary heat, dual fuel, mini splits, RV, convectors, radiant ceiling, electric baseboard at 120–240 V
Power
24 V AC or 2 AA batteries; C-wire needed only on heat-only and cool-only systems
Accuracy
±1 °F
Display range
41 °F to 95 °F
Control range
44 °F to 90 °F
Swing
Separate heating and cooling cycle rate
Installation
Large terminal blocks, universal sub-base, within 30 minutes; 2 to 5 wires
Warranty
2 years, with 30-day free return
Amazon reference
B0DNDS8PKF
EAN
0607605200691
  • The only thermostat on this shelf that publishes both its compatible and its incompatible system lists
  • Publishes ±1 °F accuracy and both temperature ranges, at the joint-lowest price on this shelf for a wall thermostat
  • Non-programmable: no schedule, no app, no voice control

Best for: A single-stage furnace or boiler where the thermostat should just hold a temperature, in a wall with no common wire

≈ $27
Check price on Amazon

Specifications

Type
Wall thermostat, wired to the HVAC system — not an outlet thermostat
Systems
Single-stage heating and cooling; gas, oil or electric furnace; boiler radiant; forced air; gas fireplace at 24 V; cooling only
Not compatible with
Multi-stage, 3-wire hydronic, heat pumps with or without auxiliary heat, dual fuel, mini splits, RV, convectors, radiant ceiling, electric baseboard at 120–240 V
Power
24 V AC or 2 AA batteries; C-wire needed only on heat-only and cool-only systems
Accuracy
±1 °F
Display range
41 °F to 95 °F
Control range
44 °F to 90 °F
Swing
Separate heating and cooling cycle rate
Installation
Large terminal blocks, universal sub-base, within 30 minutes; 2 to 5 wires
Warranty
2 years, with 30-day free return
Amazon reference
B0DNDS8PKF
EAN
0607605200691

What the maker puts in writing

  • Single stage, 1 heat / 1 cool · compatible AND incompatible lists published
  • 24 V AC or 2 AA cells; C-wire only on heat-only or cool-only systems
  • ±1 °F · display 41–95 °F · control 44–90 °F
  • Separate heating and cooling swing · installs in 30 minutes, 2 to 5 wires
  • 2-year warranty, 30-day return

Both lists, which is rare

Most thermostat listings tell you what they fit. Two on this shelf tell you what they do not. One tells you both, and that one is this.

Gas fireplace at 24 volts is in the compatible list; electric baseboard at 120 to 240 volts is in the incompatible one. Those are the two edges people get wrong.

A degree, for twenty-seven dollars

Plus or minus one degree Fahrenheit, published. The same brand’s Wi-Fi thermostat on this shelf publishes two degrees at nearly twice the price.

If the job is holding a room at a temperature rather than scheduling it from a phone, the cheap end of this shelf is also the accurate end.

Availability

Read on the day this page was built: $27 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-04. The live price is at the top of the page.

The questions that keep coming up

Does it need a C-wire?

Only on heat-only and cool-only systems. On a conventional heat-and-cool system it runs on 24 V from the system or on two AA cells. Four thermostats on this shelf require a C-wire outright.

How is it different from the Suuwer at the same price?

The figures are the same — ±1 °F, 41 to 95 °F display, 44 to 90 °F control, two-year warranty, the same 2-to-5-wire caution. This one lists compatible systems as well as incompatible ones and takes AA cells; the Suuwer publishes a swing range of 0.2 to 2 °F and a selectable 5-minute compressor delay, and takes AAA. They read like the same hardware documented two different ways.

What is a swing or cycle rate?

How far the room is allowed to drift before the system restarts. A wide swing cycles less and feels less even; a narrow one is the reverse. This listing offers separate heating and cooling swings without a range; the Suuwer publishes 0.2 to 2 °F.

More outlet thermostats

  • Sensi Smart Thermostat ST55 on a wall with button controls

    Sensi ST55

    A Wi-Fi smart wall thermostat that needs no C-wire in most homes, with a built-in level and a privacy pledge.

    Type
    Wall thermostat, wired to the HVAC system — not an outlet thermostat
    C-wire
    Not required in most applications
    Savings claim
    About 23% on HVAC energy
    Installation
    Built-in level and step-by-step app instructions
    Form
    Buttons, not a touchscreen; fits the footprint of a traditional thermostat
    Privacy
    The maker states it will not sell your personal information to third parties
    Maintenance
    Usage reports, equipment alerts, filter replacement reminders
    Certification
    Energy Star
    Accuracy
    Not stated by the maker
    Amazon reference
    B01NB1OB0I
    EAN
    0786710554827
    • No C-wire in most applications, which removes the single biggest installation obstacle on this shelf
    • The only thermostat here with a privacy commitment in writing, and the only one with a built-in level
    • The 23 per cent saving has no stated baseline, where the ecobee on this shelf names one

    Best for: A retrofit where the wall has no common wire and the old thermostat’s outline must not show

    ≈ $100
    Check price on Amazon
  • Suuwer non-programmable thermostat with blue backlit display on a wall

    Suuwer S701

    A non-programmable single-stage wall thermostat with a 0.2-to-2 °F swing, a selectable five-minute compressor delay and ±1 °F accuracy.

    Type
    Wall thermostat, wired to the HVAC system — not an outlet thermostat
    Systems
    Conventional single stage, up to 1 heat and 1 cool: gas, oil or electric furnace, ventilation and air conditioning
    Not compatible with
    Multi-stage (1H/2C, 2H/2C), heat pumps (2H/1C, 4H/2C), PTACs, 3-wire hydronic, dual fuel, 120–240 V line voltage, mini splits, RV Mach and Roughneck series
    Power
    24 V AC or 2 AAA batteries; no C-wire on most systems
    Swing
    Separate heating and cooling, 0.2 °F to 2 °F
    Compressor delay
    5 minutes, selectable on or off
    Accuracy
    ±1 °F, with room temperature calibration
    Ranges
    Display 41–95 °F; control 44–90 °F
    Warranty
    2 years
    Amazon reference
    B07WTDPPRX
    EAN
    0709327753278
    • The only thermostat on this shelf that publishes a swing range — 0.2 to 2 °F — which is the setting that governs how evenly the house is heated
    • A selectable five-minute compressor delay, which protects an air conditioner from short-cycling and which nothing else here publishes
    • Non-programmable: no schedule, no app, no voice

    Best for: A single-stage system where the owner wants to tune the cycle rate and protect the compressor

    ≈ $27
    Check price on Amazon
  • ChiliTec ST35 plug-in outlet thermostat with analog rotary dial

    ChiliTec ST35

    ChiliTec's ST35 is an analog plug-in thermostat rated 230 V, max. 16 A / 3,500 W, switching a connected heater or fan on and off around a 5–30 °C (41 to 86 °F) setpoint in 1 °C steps. A slide switch sets heating or cooling mode, and the sensor is built into the plug itself rather than an external probe.

    Max. load
    230 V, 16 A, max. 3,500 W — stated by ChiliTec
    Temperature range
    +5 °C (41 °F) to +30 °C (86 °F), adjustable in 1 °C steps
    Switching behavior
    ±1 °C (34 °F) threshold, 10-second measurement interval, with a delayed reading ChiliTec says is meant to stop the relay tripping on a passing draft
    Mode switch
    Slide switch between heating and cooling; the connected device is driven in whichever mode is selected
    Sensor
    Internal — reads the air at the plug, not a remote probe
    Protection rating
    IP20, indoor use only
    Dimensions / weight
    H 128 × W 68 × D 39 mm (5.04 × 2.68 × 1.54 in) as plugged in; 190 g
    Amazon reference
    B01MZFKWS5 (EAN 4250416312457) — live offer confirmed on DE/FR/IT/ES; listed with no live offer on GB, no ASIN found on US, at check time
    • 3,500 W / 16 A rating is published by name, not left to be inferred from the plug
    • A heating/cooling slide switch means the same unit can drive a fan or a cooling device, not only a heater
    • Internal sensor only — it reads the air right at the socket, which runs warmer than the middle of the room once a heater has been on for a while

    Best for: Adding a numeric-ish setpoint to a heater or fan that only has a low/medium/high dial, in a dry room where the socket sits close to where you actually want the temperature held.

    Search Amazon for this model

Elsewhere in the spares drawer

  • XINNIKESI insulated aluminum foil air conditioning pipe cover with zip

    XINNIKESI XINNIKESI

    A zipped double-layer foil and oxford sleeve for refrigerant lines from a quarter inch to one and an eighth.

    Type
    Refrigerant line cover — not a unit cover
    Fits pipe
    1/4 in to 1 1/8 in diameter
    Construction
    Double-layer aluminum foil with reinforced oxford cloth
    Closure
    Zip, universal, no tools
    Protects against
    UV damage, extreme temperatures, heavy rainfall
    Function
    Reflective foil reduces heat transfer; oxford cloth resists tearing
    Use
    Indoor or outdoor; balconies, rooftops, exterior walls
    Systems
    Window-mounted or split systems
    Length
    Not stated by the maker
    Amazon reference
    B0FVR9379C
    EAN
    7698310251965
    • The only product on this shelf for the refrigerant lines, which lose efficiency when their insulation perishes in sunlight
    • Covers a real range of pipe sizes — 1/4 to 1 1/8 inch — with a zip, so it goes on without cutting the line
    • Does not publish its length, which is the dimension you need to know how much pipe it covers

    Best for: A split system whose line insulation has gone grey and crumbly in the sun

    ≈ $17
    Check price on Amazon
  • Acfun universal air conditioner remote control with LCD display

    Acfun Acfun

    A universal LCD air conditioner remote with automatic code search and an 8-to-10-meter range, excluding window and portable units.

    Type
    Universal, LCD, with digital automatic code searching
    Claimed coverage
    Over 1,000 air conditioner brands
    Does NOT work with
    Window or portable air conditioners — stated twice
    Also excluded
    Frigidaire, Mitsubishi, Sanyo, and Sharp AF-Q60RX
    Range
    Approximately 8 to 10 meters (26 to 33 ft)
    Batteries
    2 × AAA, not included
    Manual
    English, in the package and in the listing images
    Programming
    Required — automatic code search
    Contradiction
    The title lists Mitsubishi as supported; the fifth bullet lists it as unsupported
    Amazon reference
    B07DN9PYKQ
    EAN
    0656516056903
    • The only remote on this shelf that publishes a working range: approximately 8 to 10 meters (26 to 33 ft)
    • The lowest price here, with an automatic code search and an English manual included
    • It does not work with window or portable air conditioners, which is most of what this site covers

    Best for: A wall-mounted split or ductless indoor unit from a brand not on its exclusion list

    ≈ $7
    Check price on Amazon
  • AZBME replacement remote control for Fujitsu air conditioner with LCD display

    AZBME Not stated by the maker

    A Fujitsu replacement remote covering more than fifty unit codes, showing both temperature scales, with a luminous mode.

    For
    Fujitsu AR-RAH2U and AR-RAH1U, with over fifty ASU, AOU, AUU and Ar-Ry unit codes listed
    Display
    Fahrenheit and Celsius
    Luminous mode
    Yes — usable in the dark
    Materials
    Recyclable ABS body with soft rubber buttons
    Batteries
    Not included; AAA 1.5 V
    Type
    IR remote
    Universal
    No — model specific
    Programming
    Not stated by the maker
    Amazon reference
    B0FDH6MRZB
    EAN
    0733723740891
    • The only remote on this shelf with a luminous mode, which is the whole problem with a bedroom remote at two in the morning
    • Publishes both temperature scales, where one remote here is Celsius only and seven say nothing
    • Fujitsu only: the code lists are long but they are all one brand

    Best for: A Fujitsu wall or ceiling unit, especially in a bedroom where the remote is used in the dark

    ≈ $17
    Check price on Amazon

All outlet thermostats